Furnace.



L. S. HUGHES.

FURNAGE.

APPLICATION FILED MAR. 20, 1906. RBNEWBD NOV, 27,1908.

Patented May 4, 1909.

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'tain new and useful Improvement in Fur- `with the drawing in a simpleand ctiicacious UNrrED sTArns PATENT OFFICE.

LOUIS S. HUGHES, OF JOPLIN, MISSOURI, ASSIGNOR TO PIGHER LEAD COMPANY,OF `IOPLIN,

MISSOURI,

A CORPORATION OF MISSOURI.

FURN ACE Application led latch 20, 1806, Serial No. 306,955.

To all whom it may concern:

Be it. known that I, Louis S. HUGHES, a citizen of the United States ofAmerica, residing in Joplin, in the county of Jasper and State ofMissouri, have invented a cernaces, of which the following is a true andexact description, reference being had to the accompanying drawings,which form a part thereof.

My invention relates to furnace construction and has for its object toprovide a furnace of novel construction and one adapted for thecommercial exploitation of novel methods of treating ores, notably of aproccss in which galena, finely divided and in intimate mixture withair, is ignited and caused to produce from its lead and sulfur leadsulfate in a condition for use as pigment without fusion of the ore andwith little or no decomposition of such iron sulfid as may be present,this process forming the subject :matter of my copcnding application forLetters latent filed February '14th, 1906, Serial Xumber 300,966.

rlhe novel features of my furnace will be best understood as describedin connection commercial form and in which- Figure l is au elevation ofa furnace, partly in central vertical section showing in connection withthe furnace the lines and screen system which are conveniently providedfor 'the recovery of the lead sulfate or sublimed White lead as it iscommercially` known. Fig. 2 is a cross-section on the line 2--Q of Fig.l.

A, indicates the furnace body which, for the best results, should bevertical as shown and which is characterized in that it is unlined withrefractory material and so constructed that it will rapidly abstractheat from a burning mass within the furnace chamber. I have found itunnecessary to use Water jackets or cooling fines in connection with thefurnace and that the abstraction of the heat therefrom is sufficientlyenergetic if the furnace body is constructed with sheet metal or boilerplate.

B is a conical bottom to the furnace chamber terminating in a verticalconduit section C, below which, by preference, I form a collectingchamber D, having a removable bottom closing plate, as indicated at E.

F, is an air blast pipe, as shown entering the i Specification ofLetters Patent.

Patented May 4, 1909.

Renewed November 27, 1908. Serial No. 464,781.

conduit C, which conduit forms a vertical eX- tension or nozzle for theblast pipe.

(l. is an ore feeding` chute through which linely divided ore is fed tothe furnace.

H, is au annular gas supply pipe con nected with any source of gassupply and connecting with the interior of the furnace with a series ofgas burner pipes I, l. etc., which project through the walls of, thefurnace A. and, preferably, to'some distance within the same. These gasburner pipes are surrounded by air supply pipes or tubes as indicated atJ, J; these tubes also extending to some distance Within the walls ofthe furnace land the series of burners being preferably situated in ahorizontalV plane and so as to form an interior zone of non-reducingflame, as indicated at L; the construction also being such that thiszone does not come in contact with the walls of the furnace or directlyheat the same.

K, is a door leading into the furnace. M', a flue leading from the topof the furnace and having connected with its bottom hoppers, asindicated at N, N, in which subsided impurities are collected. The flueM, has situated in it a suction fan, indicated at 0. and terminates inthe horizontal section B, with the top of which areconnected the fabricbags, indicated at Q, Q, etc., and to the bottoms of which areconnected' the pigment receiving hoppers R, R, etc., S, indicating thehouse surrounding the screen system. I have sometimes found it necessaryor advisable to supply additional heating zones in the flue M, for thepurpose of burning out any combustible impurities whichv the furnaceitself.

In operation, the bottom plate E, is closed, air and gas suppliedthrough the burner tubes I. and J, and ignited in the center of thefurnace, air turned on through the pipe l", and projected upwardvertically in the furnace through the heating zone and pulverized orefed to the furnace through the chute G, the ore being carried up int'othe heating'zonc by the air blast, ignited therein and burning in theupper part of the furnace body. The heat due to the ignition andcombustion of the ore being largely carried away through the conductingwalls of the furnace so that it is not permitted to attain such heat aswould result in the fusion of the ore or the i 'tion of such impuritiesas iron sulid. Uniilrned particles of ore are constantly kept in motionby the air blast, the heavy particles not escaping from the furnace butbeing from time to time permitted to settle into the chamber D, thisoccurring whenever the air blast is shut off. The sublimed lead sulfateis carried thromfh the flue and screen system described and finallycollected inthe hoppers l, heavy impuritic; settling in the flue andbeing collected in the hoppers M.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is- 1. A furnace for oxidizing ores at lowtemperatures consisting of a furnace chamber having means for forcingair into one end of the furnace, one or more igniting burners situatednear the same end, means for feeding pulverized ore to the action of theair blast, the furnace beyond the ignition burner being constructed toabstract heat and thereby lower the temperature of the burning oremixture.

2. A furnace having in combination an upright body ortion constructed toabstract heat from and) lower the temperature of the ignited charge inthe furnace, a series of air fed gas burners rejecting laterally throughthe walls of the body portion above but near its base, an air blastconduit directed axially upward from vthe bottom of the furnace andmeans for feeding nely divided ore to the furnace.

' 3. A furnace for oxidizing ores at low temperatures consisting of anupright furnace chamber of unlined sheet metal directly exposed to heatabstracting conditions, said chamber having a hopper shaped bottom, in'

combination with an ignition burner entering the furnace above but nearthe bottom thereof, an air blast conduit directed axially upward fromthe bottom of the furnace and means for feeding pulverized fuel to thefurnace.

4. A furnace for oxidizing ores at low temperatures consisting of anupright furnace chamber of unlined sheet metal directly exposed to heatabstracting conditions, said chamber having a hopper shaped bottom, incombination with a series of symmetrically disposed ignition burnersentering the furnace above but near the bottom thereof in a horizontalplane, an air blast conduit directed axially upward from the bottom ofthe furnace and means for feeding pulverized fuel to the furnace.

5. A furnace for oxidizing ores at low temperatures consisting of anupright furnace chamber of unlined sheet metal directly exposed to heatabstracting conditions, said chamber having a hopper shaped bottom, incombination with an ignition burner entering the furnace above but nearthe bottom thereof, an air blast conduit directed axially upward fromthe bottom of the furnace, means for feeding pulver-ized fuel to thefurnace, a conduit leading from thetop of the furnace and a screensystem connected to the conduit.

6. An upright furnace of unlined sheet metal having a hopper shapedbottom, a chamber situated below and connected to the hopper bottoms,means for directing an axial air blast through the furnace, and gasburners entering the furnace near its bottom.

LOUIS S. HUGHES. llitnesses:

J CHARLOW, BELLE SPARKS.

